Radius of Gyration: measurement related to weight distribution of the core. This affects how quickly a ball will get in to a roll. A ball with a higher RG will roll later. A ball with lower RG will roll sooner.

16 LB. - 2.54

15 LB. - 2.53

14 LB. - 2.56

13 LB. - 2.62

12 LB. - 2.68

Differential

Difference between the RG of the core's x-axis and y-axis. Indicates track flare potential and stability. A higher differential means more flare potential and less stabilty. A low differential ball will be more stable and have less flare potential.

16 LB. - .042

15 LB. - .050

14 LB. - .048

13 LB. - .037

12 LB. - .027

Intermediate Differential

Difference between the RG of the core's x-axis and Z-axis on an asymmetrical core. Indicates the asymmetry of the core. A higher intermediate differential ball will be less stable and will transition more quickly from skid to roll than a ball with lower intermediate differential.

Spare + Honor Roll

Spare + Product Notes

Manufacturer’s Intent

Every ball we design at Track serves a purpose and this one is no different. Unlike the traditional plastic ball, the Spare + features a performance core which allows this new release to not only pick up spares, but strikes when other balls are hooking too much.

Core

The Spare + features a single density version of our high performance i-Core. The large flare potential, combined with the assymetric core design, will give the Spare + the hitting power traditional polyester balls simply can’t provide.

Cover

Polyester covers provided a decent amount of hook back in the 70’s. Today, they make perfect spare balls due to the low friction levels they create on modern bowling environments.

Finish

This one comes with a 800/1000/2000 Abralon® Polished w/ Powerhouse Factory Finish Polish. This finish is perfect for picking up spares and for drier lane conditions.

Overall

The new Track Spare + is not only the best looking polyester ball on the market, it is also multi-functional. With this new release, we are giving Track fans the spare ball they require, along with extra hitting power making the Spare + a useful strike ball as well.